to expect from paul ryan. paul ryan, even before he was picked as mitt romney's runningmate was making the argument what the country needed was a choice. this is going to be two alternative visions of two futures for the country. it wasn't going to be a referendum. i expect paul ryan to lay out that choice. the big question for me is what joe biden is going to do. is he going to try on his own to reverse the momentum, as joe suggests, being aggressive, going after paul ryan? or play the role of elder statesman, let the debate come to him and attack paul ryan when he has an opportunity. >> more along the lines of what he did four years ago. stick around after the debate for a complete analysis. and we are partnering with twitter, an online service that lets you chat with short messages, in case you didn't know that. they are monitoring the millions of tweets sent before and after the debate. we will highlight the moments that got the most people tweeting. follow me and bret on twitter. we will be sending out behind-the-scenes shots. >> did@nana sign up. >> somebody tried to coopt that.